Aspiring filmmaker Mark Twitchell has been found guilty of first-degree murder and sentenced to life in prison without the possibility of parole for 25 years in 2011. Tune in to get inside the case of the Dexter Copy-Cat Killer, Mark Twitchell. Gilles Tetreault's interview with Detective Bill Clark : https://www.youtube.com/watch?v=WpL8nR-C0qc